{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T13:17:26.736Z","years_from_j2000":26.686,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-10720","name":"HD 10720","class":"k2v_orange_dwarf","category":"star","object_type":"K2V orange dwarf","mag":9.13,"mag_band":"V","abs_mag":6.212,"abs_mag_band":"V","distance_ly":125.06009684619724,"distance_method":"parallax","ra_deg":25.79643,"dec_deg":-58.010125,"epoch_ra_deg":26.037547,"epoch_dec_deg":-57.875953,"epoch_moved_arcsec":6.414,"pm_ra_mas_yr":-149.96,"pm_dec_mas_yr":-187.83,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydrus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-10720","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01432-5801","companions":[{"measured":2015,"magnitude":11.82,"components":"AB","discoverer_code":"HDS 229","separation_arcsec":16.7,"position_angle_deg":355},{"measured":2015,"magnitude":15.7,"components":"AC","discoverer_code":"SKF 417","separation_arcsec":25.3,"position_angle_deg":103}],"spectral_type":"K2V","color_index_bv":0.874,"luminosity_solar":0.28523315122990106,"variable_mag_max":9.091,"variable_mag_min":9.271,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1972AJ.....77..486U, quality C)","surface_temperature_k":4929,"proper_motion_ra_mas_yr":-149.96,"proper_motion_dec_mas_yr":-187.83,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 10720"},{"catalog":"HIP","designation":"HIP 8035"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}